Hyundai Kona: Immobilizer System / Description and operation
The immobilizer system will disable the vehicle unless the proper ignition
key is used, in addition to the currently available anti-theft systems such
as car alarms, the immobilizer system aims to drastically reduce the rate
of auto theft.
1. |
Transponder (TP) – IMMO ECU Communication

TP Read Protocol
(1) |
IMMO_ECU after IGN on(or CPU Reset cancellation) is sent
Challenge to TP and confirmed Serial Number and Signature.
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(2) |
When response of input transponder is not correct, input
is retry.
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(3) |
When response of input transponder is correct, The data
that calculate Encryption operation in the EEPROM program
compared with received data from TP.
When Codes is same, input is finished.
If the codes are not same, input are continued until when
codes are same.
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(4) |
If IMMO_ECU EEPROM code is not programming, when correct
transponder is inputted (CRC Check OK), input is finished.
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(5) |
After IGN1 on(CPU Reset cancellation), IMMO_ECU is reading
the maximum 5times Transponder Code
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(6) |
In the IGN1 ON&EMS_state=Lock state, when received ANKNOWLEDGE,
TP is re-authenticated

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2. |
Transponder / IMMO ECU / EMS authentication

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PCM (Power Train Control Module)
1. |
The PCM(ECM) (A) carries out a check of the ignition key using a
special encryption algorithm, which is programmed into the transponder
as well as the PCM(ECM) simultaneously. Only if the results are
equal, the engine can be started. The data of all transponders,
which are valid for the vehicle, are stored in the PCM(ECM).
ERN (Encrypted Randorm Number) value between EMS and encrypted smartra
unit is checked and the validity of coded key is decided by EMS.

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ENCRYPTED IMMOBILIZER unit (A)
The IMMOBILIZER carries out communication with the built-in transponder
in the ignition key. This wireless communication runs on RF (Radio frequency
of 125 kHz). The IMMOBILIZER is mounted behind of the crash pad close to
center cross bar.
The RF signal from the transponder, received by the antenna coil, is converted
into messages for serial communication by the IMMOBILIZER device. And, the
received messages from the PCM(ECM) are converted into an RF signal, which
is transmitted to the transponder by the antenna.
The IMMOBILIZER does not carry out the validity check of the transponder
or the calculation of encryption algorithm. This device is only an advanced
interface, which converts the RF data flow of the transponder into serial
communication to the PCM(ECM) and vice versa.

TRANSPONDER (Built-in keys)
The transponder has an advanced encryption algorithm. During the key teaching
procedure, the transponder will be programmed with vehicle specific data.
The vehicle specific data are written into the transponder memory. The write
procedure is once only; therefore, the contents of the transponder can never
be modified or changed.


Antenna Coil
The antenna coil (A) has the following functions.
– |
The antenna coil supplies energy to the transponder.
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– |
The antenna coil receives signal from the transponder.
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– |
The antenna coil sends transponder signal to the IMMOBILIZER.
It is located directly in front of the steering handle lock.
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Teaching Procedures
1.
Key Teaching Procedure
Key teaching must be done after replacing a defective PCM(ECM) or
when providing additional keys ...
Other information:
Hyundai Kona (OS) 2018-2025 Service Manual: Description and operation
Description
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Hyundai Kona (OS) 2018-2025 Owners Manual: Inside rearview mirror
Before you start driving, adjust the rearview mirror to the center on the view
through the rear window.
WARNING
Make sure your line of sight is not obstructed. Do not place objects in the
rear seat, cargo area, or behind the rear headrests which could interfere with your
vision through the rear w ...